62 lines
2.1 KiB
Rust
62 lines
2.1 KiB
Rust
use phf::{phf_set, Set};
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use crate::err::ProcessingResult;
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use crate::proc::{Processor, ProcessorRange};
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use crate::spec::codepoint::is_control;
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use crate::unit::attr::value::{DelimiterType, process_attr_value, ProcessedAttrValue};
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mod value;
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static COLLAPSIBLE_AND_TRIMMABLE_ATTRS: Set<&'static [u8]> = phf_set! {
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b"class",
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};
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub enum AttrType {
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Quoted,
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Unquoted,
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NoValue,
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}
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pub struct ProcessedAttr {
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pub name: ProcessorRange,
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pub typ: AttrType,
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pub value: Option<ProcessorRange>,
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}
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// Characters allowed in an attribute name.
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// NOTE: Unicode noncharacters not tested.
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// See https://html.spec.whatwg.org/multipage/syntax.html#syntax-attribute-name for spec.
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fn is_name_char(c: u8) -> bool {
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match c {
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b' ' | b'"' | b'\'' | b'>' | b'/' | b'=' => false,
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c => !is_control(c),
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}
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}
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pub fn process_attr(proc: &mut Processor) -> ProcessingResult<ProcessedAttr> {
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// Expect `process_attr` to be called at an attribute.
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let name = chain!(proc.match_while_pred(is_name_char).expect().keep().range());
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let after_name = proc.checkpoint();
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// TODO DOC Attr must be case sensitive
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let should_collapse_and_trim_value_ws = COLLAPSIBLE_AND_TRIMMABLE_ATTRS.contains(&proc[name]);
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let has_value = chain!(proc.match_char(b'=').keep().matched());
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let (typ, value) = if !has_value {
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(AttrType::NoValue, None)
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} else {
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match process_attr_value(proc, should_collapse_and_trim_value_ws)? {
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ProcessedAttrValue { value: None, .. } => {
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// Value is empty, which is equivalent to no value, so discard `=` and any quotes.
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proc.erase_written(after_name);
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(AttrType::NoValue, None)
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}
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ProcessedAttrValue { delimiter: DelimiterType::Unquoted, value } => (AttrType::Unquoted, value),
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ProcessedAttrValue { delimiter: DelimiterType::Double, value } | ProcessedAttrValue { delimiter: DelimiterType::Single, value } => (AttrType::Quoted, value),
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}
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};
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Ok(ProcessedAttr { name, typ, value })
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}
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